zypper is the suse package manager.
Ubuntu uses apt (in whatever flavor you choose. aptitude, apt-get, etc.).
You might be able to find a version of zypper for Ubuntu but I wouldn't bet on it... nor would I suggest you even bother trying. Just use one of the apt family of tools.
As an aside that error isn't directly related to the zypper problem and is actually an issue in the 'command not found' helper that Ubuntu tried to use to tell you what to install to get the command you wanted. I have no idea why that would be happening offhand but it certainly appears to be a local issue.